The patterns of forest soil particulate and mineral associated organic carbon characteristics with latitude and soil depth across eastern China  

作　　者：Yunlong Hu Gukailin Ao Jiguang Feng Xiao Chen Biao Zhu 

机构地区：[1]Institute of Ecology and Ministry of Education Key Laboratory for Earth Surface Processes,College of Urban and Environmental Sciences,Peking University,Beijing,100871,China [2]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,100029,China

出　　处：《Forest Ecosystems》2025年第2期360-367,共8页森林生态系统(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(Nos.42141006,32425038 and 31988102).

摘　　要：Forest ecosystems function as the largest carbon(C)sink in terrestrial ecosystems,and nearly half of the C in forest ecosystems is stored in forest soils.However,the patterns of two main fractions of soil organic C,particulate organic C(POC)and mineral-associated organic C(MAOC),across various types of forest ecosystems remain unclear.In this study,soil samples were collected from depths of 0–100 cm at eight sites located between 18°and 48°north latitude in eastern China.The soil samples were then separated into particulate organic matter(POM)and mineral-associated organic matter(MAOM)based on particle size to analyze the distribution of C within each fraction.The results showed that the C stored as POC increased with latitude and decreased with soil depth.Specifically,28.1%,38.5%and 55.6%of C was stored as POC in the topsoil(0–30 cm)of tropical,subtropical and temperate forests,respectively,while 24.0%,24.3%and 38.9%of C was stored as POC in the subsoil(30–100 cm)of the corresponding forests,respectively.MAOC experienced a higher degree of microbial processing(indicated by differences in δ^(13)C,δ^(15)N and C:N between POM and MAOM)than POC,with a more pronounced difference in microbial processing between MAOC and POC at lower latitudes than at higher latitudes.These findings contribute to a comprehensive understanding of the characteristics of forest SOC and offer potential strategies for enhancing forest C sequestration.

关 键 词：Forest soils Particulate organic carbon Mineral-associated organic carbon Soil microbial processing Environmental controls 

分 类 号：S714[农业科学—林学]